<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusable="true"
android:focusableInTouchMode="true"
tools:context="com.hiwhitley.demo.MainActivity">
<com.hiwhitley.demo.AmountView
android:id="@+id/amount_view"
android:layout_width="wrap_content"
android:layout_height="36dp"
android:layout_centerInParent="true"
android:layout_gravity="right"
android:layout_marginRight="15dp"
app:btnTextSize="14sp"
app:btnWidth="36dp"
app:tvWidth="50dp"/>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:focusable="true"
android:divider="@drawable/divider"
android:background="@drawable/bg_amount_layout"
android:showDividers="middle"
android:orientation="horizontal">
<Button
android:id="@+id/btnDecrease"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:background="@drawable/btn_amount"
android:text="-"/>
<EditText
android:id="@+id/etAmount"
android:layout_width="0dp"
android:layout_height="match_parent"
android:minWidth="60dp"
android:layout_weight="2"
android:background="@null"
android:inputType="number"
android:gravity="center"
android:text="1"/>
<Button
android:id="@+id/btnIncrease"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:gravity="center"
android:background="@drawable/btn_amount"
android:text="+"/>
</LinearLayout>
attrs
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="AmountView">
<!-- 左右2边+-按钮的宽度 -->
<attr name="btnWidth" format="dimension" />
<!-- 中间TextView的宽度 -->
<attr name="tvWidth" format="dimension" />
<!--<attr name="tvColor" format="color"/>-->
<attr name="tvTextSize" format="dimension"/>
<attr name="btnTextSize" format="dimension"/>
</declare-styleable>
</resources>
AmountView类
/**
* 自定义组件：购买数量，带减少增加按钮
* Created by hiwhitley on 2016/7/4.
*/
public class AmountView extends LinearLayout implements View.OnClickListener, TextWatcher {
private static final String TAG = "AmountView";
private int amount = 1; //购买数量
private int goods_storage = 1; //商品库存
private OnAmountChangeListener mListener;
private EditText etAmount;
private Button btnDecrease;
private Button btnIncrease;
public AmountView(Context context) {
this(context, null);
}
public AmountView(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater.from(context).inflate(R.layout.view_amount, this);
etAmount = (EditText) findViewById(R.id.etAmount);
btnDecrease = (Button) findViewById(R.id.btnDecrease);
btnIncrease = (Button) findViewById(R.id.btnIncrease);
btnDecrease.setOnClickListener(this);
btnIncrease.setOnClickListener(this);
etAmount.addTextChangedListener(this);
TypedArray obtainStyledAttributes = getContext().obtainStyledAttributes(attrs, R.styleable.AmountView);
int btnWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_btnWidth, LayoutParams.WRAP_CONTENT);
int tvWidth = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_tvWidth, 80);
int tvTextSize = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_tvTextSize, 0);
int btnTextSize = obtainStyledAttributes.getDimensionPixelSize(R.styleable.AmountView_btnTextSize, 0);
obtainStyledAttributes.recycle();
LayoutParams btnParams = new LayoutParams(btnWidth, LayoutParams.MATCH_PARENT);
btnDecrease.setLayoutParams(btnParams);
btnIncrease.setLayoutParams(btnParams);
if (btnTextSize != 0) {
btnDecrease.setTextSize(TypedValue.COMPLEX_UNIT_PX, btnTextSize);
btnIncrease.setTextSize(TypedValue.COMPLEX_UNIT_PX, btnTextSize);
}
LayoutParams textParams = new LayoutParams(tvWidth, LayoutParams.MATCH_PARENT);
etAmount.setLayoutParams(textParams);
if (tvTextSize != 0) {
etAmount.setTextSize(tvTextSize);
}
}
public void setOnAmountChangeListener(OnAmountChangeListener onAmountChangeListener) {
this.mListener = onAmountChangeListener;
}
public void setGoods_storage(int goods_storage) {
this.goods_storage = goods_storage;
}
@Override
public void onClick(View v) {
int i = v.getId();
if (i == R.id.btnDecrease) {
if (amount > 1) {
amount--;
etAmount.setText(amount + "");
}
} else if (i == R.id.btnIncrease) {
if (amount < goods_storage) {
amount++;
etAmount.setText(amount + "");
}
}
etAmount.clearFocus();
if (mListener != null) {
mListener.onAmountChange(this, amount);
}
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
if (s.toString().isEmpty())
return;
amount = Integer.valueOf(s.toString());
if (amount > goods_storage) {
etAmount.setText(goods_storage + "");
return;
}
if (mListener != null) {
mListener.onAmountChange(this, amount);
}
}
public interface OnAmountChangeListener {
void onAmountChange(View view, int amount);
}
}
主界面：
public class MainActivity extends AppCompatActivity {
private AmountView mAmountView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAmountView = (AmountView) findViewById(R.id.amount_view);
mAmountView.setGoods_storage(50);
mAmountView.setOnAmountChangeListener(new AmountView.OnAmountChangeListener() {
@Override
public void onAmountChange(View view, int amount) {
Toast.makeText(getApplicationContext(), "Amount=> " + amount, Toast.LENGTH_SHORT).show();
}
});
}
}
